Furnace



may 13 1924. 1,493,748

B. S. HARRISON FURNACE Filed April 4, 1923 772272655 -%MZZM ECM1.

Patent May 13, 1924.

OFFICE.

SYSTEMS, INC. 0F

- CHICAGO, ILLINOIS, CORPORATION OF ILLINOIS.

FURNACE.

Application filed April 4, 1923. Serial No. 629,800.

To all whom it may concern:

Be it known that I, BURT S. HARRISON, a citizen of the United States of America, and a resident of Chicago, county of Cook, and State of Illinois, have invented a new and useful Improvement in Furnaces, of which the following is a specification.

This invention relates to furnaces for the combustion of liquid, gaseous, or pulverized fuels. The object of the invention is to improve the construction of combustion cham here so that when formed of the usual refractory materials, such as firebrick or tiles, the furnace may withstand the ordinarily destructive action of high temperatures.

The objects of the invention are accomplished by the construction shown in the accompanying drawing, in which Fig. 1 is a transverse sectional view of a furnace constructed according to this invention.

Fig. 2 is a longitudinal sectional view taken on the line 22 of Fig. 1.

As shown in the drawings, the furnace comprises side walls and a crown or arched shaped roof of substantially standard deslgn, but resting upon the floor of the furnace, and extending longitudinally therein is a primary combustion chamber of preferably triangular form in cross section. It

is found in practice that this triangular,

form of combustion chamber when made of the same material as is customary in the side walls and roof of a furnace, can properly withstand the high temperatures of a liquid fuel or gas flame, whereas if the furnace is not provided with this triangular form of combustion chamber, the arched shaped roof, probably due to the internal stresses of its own load, will in time deteriorate under the action of the heat of combustion, so that it becomes necessary to rebuild the roof of the furnace. With the trian ular construction of combustion cham er, the entire furnace has its period of usefulness much lengthened, and this primary combustion chamber of triangular form is capable of withstanding higher temperatures than would be the case if it were of the usual rectangular form and roofed over. Aside from this, should the walls of the triangular or primary combustion chamber deteriorate or sag in time, the

replacement of such walls is a much simpler operation than rebuilding the roof of the furnace.

Referring to the drawings, the floor 1, side walls 2, end walls 3 and 4, and the roof 5, may be of any well-known or customary design. The primary combustion chamber 6 to which this invention directly relates, consists of two sets of slabs 7 and 8 inclined as shown in the drawing and resting against each other at their upper edges. These slabs are formed of any high grade fire-resisting material and are slightly spaced apart longitudinally of the furnace, as shown in Fig. 2, to provide the slots 9 between the slabs in order that the pressures within and outside of the primary combustion chamber may equalize to some extent in order to avoid an excessive pressure in the primary combustion chamber.

Fuel is projected into the furnace through the venturi-shaped opening 10 at the front end, preferably at a velocity which will avoid an excessive erosive action on the rear wall 4. Combustion may be substantially complete within the chamber 6, but if not, the expanded gases in the enlarged space 11 may continue to burn at a lower temperature. After passing out of chamber 6 through the outlets 12 at the rear end of the furnace, below the horizontal deflecting shelf 13, the products of combustion leave the chamber 11 through the roof of the furnace through the equally spaced vertical outlets 14. From here the products of combustion pass to a boiler surface or other heat absorbing part of the furnace.

The primary combustion chamber 6 preferably does not extend all the way to the front wall of the furnace, in order to provide for the recirculation of part of the gases through the opening 15 by the inductive action of the jet of fuel and air entering inlet 10. This arrangement further provides for preventing a great difference in pressures inside and outside ,of the chamber 6, and further tends to prevent eddy ourrents in, and the formation of carbon on the ways. The major combustion takes place within chamber 6 before the gases pass through the outlets 12 at the rear of chamber 6 into the main chamber 11 of the furnace. If the combustion is not complete in chamber 6, the gases may continue to burn While traveling along chamber 11 toward the outlets 14. The furnace structure proper is protected from the zone of highest temperature by the triangular combustion chamber which, due to its form, even though the temperatures are high, has long life.

I claim:

1. A furnace of the class described, provided with a longitudinally extending triangular combustion chamber formed of floor and fiat slab side walls, the slabs of said side walls being slightly spaced apart to provide pressure equalizing slots extendnaoa'ms ing at right angles to the direction of length of the combustion chamber.

2. A furnace of the class described comprising surrounding walls, and a prima combustion chamber extending longitudinally along the space within said surrounding walls, said primary combustion chamber having side walls forming a triangle with the floor of the furnace, the ends of said side walls of the primary combustion chamber being spaced from the front and rear walls of the furnace, in order to provide passageways for communication between the primary combustion chamber and the space within the surrounding Walls outside of said primary combustion chamber.

Signed at Chicago this 30 day of March,

BURT S. HARRISON. 

